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Finding the Fourth Proportional to 285,520.20, 428,280.30 and 85,871.40

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Solution

The fourth proportional to 285,520.20, 428,280.30 and 85,871.40 is: 128,807.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,520.20 : 428,280.30 = 85,871.40 : x
  2. Step 2: Convert to fraction form
    285,520.20/428,280.30 = 85,871.40/x
  3. Step 3: Cross multiply
    285,520.20x = 428,280.30 × 85,871.40
  4. Step 4: Simplify right side
    285,520.20x = 36,777,028,953.42
  5. Step 5: Solve for x
    x = 36,777,028,953.42/285,520.20
  6. Step 6: Final answer
    x = 128,807.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.